code: def test_run_with_meta(self):
      bytestream = ByteStream(
          data=b"test", meta={"author": "test_author", "language": "en"}
      )
  
      converter = TextFileToDocument()
  
      output = converter.run(
          sources=[bytestream], meta=[{"language": "it"}]
      )
      document = output["documents"][0]
  
      # check that the metadata from the bytestream is merged with that from the meta parameter
      assert document.meta == {
          "author": "test_author",
          "language": "it",
      }
  
file_path: haystack/test/components/converters/test_textfile_to_document.py
imports: import logging
  from unittest.mock import patch
  from pathlib import Path
  import pytest
  from haystack.dataclasses import ByteStream
  from haystack.components.converters.txt import TextFileToDocument
label_desc: Use image node_id 4 for calling the TestTextfileToDocument obj's underlying member method code with example usage: obj.test_run_with_meta() without return types